Let's start with the easy way: If you have basic HTML, CSS and JavaScript skills--what any web designer needs to know, in other words--you can build "web apps" and put them on any webserver. For simple reference-type apps, you can even dispense with the JavaScript. I've built several web apps this way.
Pros: minimal coding skills needed, and you don't have to go through the App Store submission process. Cons: since they're just specialized websites, you can't easily make money from them, unless you run ads. And of course they don't appear in the App Store.
If you want to sell (or even give away) apps in the App Store, you'll need Apple's iOS Software Development Kit, and you'll have to deal with a bunch of Apple red tape. It's in a good cause--keeps out malware purveyors and scam artists--but it's a nuisance.
And the SDK assumes you know Objective-C. It's not a language for beginners. (Anybody remember HyperTalk?) But there's a way around that: NimbleKit. (I'd include a link, but as a new user I'm not allowed to. Do a Google search.)
NimbleKit lets you build apps using only HTML, CSS and JavaScript--no Objective C required!--compile them with the SDK, and get them into the App Store. You still have to deal with Apple's red tape, but at least the programming part is reduced to a level that any competent web designer can handle. I've built a couple of apps for personal use this way, though I don't have anything in the App Store I can show off. But the NimbleKit home page lists a number of published apps that have been built this way.
Yes, you can hire somebody to do your coding for you. It requires a substantial investment up front, and somebody else's name will appear on your product on the App Store. I haven't tried this route, so I can't tell you more than that. I'll caution you to read the intellectual property rights part of your contract very carefully, and make sure you understand who owns what. Otherwise you could be in for a nasty surprise if it turns out that the programmer you hired legally owns your product.